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    <title>Document</title>
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      .map {
        position: relative;
        width: 800px;
        height: 500px;
        background-color: #999;
      }
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  <body>
    <div id="map" class="map"></div>
    <script src="./js/tools.js"></script>
    <script src="./js/food.js"></script>
    <script src="./js/snake.js"></script>
    <script src="./js/game.js"></script>
    <script src="./js/main.js"></script>
  </body>
</html>
